
1) Barrack 2) Barrack in a garrison town 3) Garrison
Found on
https://www.crosswordclues.com/clue/casern

A casern, also spelled cazern or caserne, is a military barracks in a garrison town. In French-speaking countries, a caserne de pompier is a fire station. In fortification, caserns are little rooms, lodgments, or apartments, erected between the ramparts, and the houses of fortified towns, or even on the ramparts themselves; to serve as lodgings fo...
Found on
http://en.wikipedia.org/wiki/Casern

barrack or billet for soldiers
Found on
http://phrontistery.info/c.html

• (n.) A lodging for soldiers in garrison towns, usually near the rampart; barracks.
Found on
http://thinkexist.com/dictionary/meaning/casern/
Ca'sern noun [ French
caserne .] A lodging for soldiers in garrison towns, usually near the rampart; barracks.
Bescherelle. Found on
http://www.encyclo.co.uk/webster/C/31

[
n] - military barracks in a garrison town
Found on
http://www.webdictionary.co.uk/definition.php?query=casern
noun military barracks in a garrison town
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.